5.8.1.3 AQA Chromatography

What is chromatography used for?

• To separate mixtures and identify substances

• To create chemical reactions

• To measure temperature changes

• To increase the speed of reactions

What are the two phases involved in chromatography?

• Solid and liquid phases

• Stationary and mobile phases

• Gas and liquid phases

• Reactive and inert phases

What does the Rf value represent in chromatography?

• The ratio of solvent to solute

• The distance moved by the substance relative to the solvent

• The speed of the solvent

• The temperature of the reaction

How can different compounds be identified using chromatography?

• By their color

• By their Rf values in different solvents

• By their boiling points

• By their melting points

What happens to a pure compound in chromatography?

• It produces multiple spots in all solvents

• It produces a single spot in all solvents

• It changes color

• It evaporates

What should students be able to explain about paper chromatography?

• How it changes the color of substances

• How it separates mixtures

• How it increases reaction speed

• How it measures temperature

What should students be able to interpret from chromatograms?

• The color changes

• The Rf values

• The temperature changes

• The volume changes

What is the formula for calculating the Rf value?

• Rf = distance moved by solvent / distance moved by substance

• Rf = distance moved by substance / distance moved by solvent

• Rf = distance moved by substance + distance moved by solvent

• Rf = distance moved by solvent - distance moved by substance

What is the role of the stationary phase in chromatography?

• To move the solvent

• To remain fixed and allow separation

• To change the temperature

• To increase the speed of the reaction

What is the role of the mobile phase in chromatography?

• To remain fixed

• To move the solvent through the stationary phase

• To change the color of the substances

• To increase the temperature